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DC10.3-20: Design, Construction, and Maintenance of Post-Tensioned Concrete Courts

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Descripción

This publication presents design and construction recommendations for post-tensioned concrete courts. This book is intended for designers, contractors, inspectors, and building officials.


Características

  • Páginas: 75
  • Edición:
  • Idioma: Ingles
  • Año: 2021

Disponibilidad: 24 horas

Contenido DC10.3-20: Design, Construction, and Maintenance of Post-Tensioned Concrete Courts

This publication presents design and construction recommendations for post-tensioned concrete courts. This book is intended for designers, contractors, inspectors, and building officials. The book also covers common maintenance, construction, and detailing issues. Chapter highlights include general considerations, design requirements, detailing considerations, construction practices, sample specification provisions, elongation, final effective force, and conversion factor tables.

New items in this update include:

• Update of provisions to 2020 quality construction standards

• Enhanced details around posts and embedments

• Additional discussion of construction documents

• Acceptance, delivery, handling, and storage recommendations for PT materials

• Additional discussion of concrete materials, placement, and finishing

• Jobsite troubleshooting guidance on causes of improper elongation, handling of problems that can occur during stressing, safety considerations, handling and prevention of stressing, strand slippage, and prevention of other common issues

• Inspection items before, during, and after stressing tendons

• Added discussion of maintenance, landscaping, and adequate drainage for PT concrete courts

Table of Contents

1 INTRODUCTION

1.1  Purpose and scope
1.2  Fabrication of tendons
1.3  Responsibilities
1.4  Definitions

2  DESIGN RECOMMENDATIONS

2.1 General
2.2 Design requirements
2.3 Final effective force per tendon
2.4  Slab/subgrade friction
2.5  Calculating required tendon spacing
   2.5.1 Sample Tendon Spacing Calculation
2.6  Designing Based on Equivalent Flexural Capacity
2.7  Detailing considerations

3  DOCUMENT CONTROL

3.1  General
3.2  LDP’s slab construction documents
3.3  Shipping documents
3.4  Material certifications
3.5  Stressing equipment calibration
3.6  Stressing records
3.7 Concrete placement records

4  ACCEPTANCE, DELIVERY, HANDLING, AND STORAGE

4.1  Acceptance and delivery
4.2  Handling and storage

5  SITE PREPARATION

5.1  Subgrade preparation
5.2  Slope and drainage

5.3  Forming and construction joints

5.4 Construction sequencing

6  CONSTRUCTION

6.1  Field placement drawing requirements
6.2  General installation procedure
6.3  Tendon layout

7  ENCAPSULATED SYSTEM

8  CONCRETE

8.1 Materials
8.2 Placement
8.3 Finishing
8.4 Restraint cracks

9  TENDON STRESSING

9.1  General
9.2  Preparation for stressing
9.3  Stressing the tendons
9.4  Causes of improper elongation
   9.4.1 Equipment
   9.4.2 Installation/concrete placement/stressing operations
   9.4.3 Design/material discrepancies

9.5 Problems that can occur during stressing
9.6  Safety considerations
9.7  Don’ts of stressing
9.8  Inspection before, during, and after stressing tendons

10  ELONGATION MEASUREMENTS

10.1  General
10.2  Preparation
10.3  Measurement
10.4  Recording

11 TENDON FINISHING

11.1  General
11.2  Requirements for cutting of tendon tails
11.3  Patching of stressing pockets

12  JOBSITE TROUBLESHOOTING

12.1  General
12.2  Preventing the most frequent problems
12.3  Strand slippage and/or stressing jack hung up
12.4 Honeycombs in concrete
12.5  Tendon and concrete blowouts
12.6  Tendon rupture
12.7  Tendons too short to be stressed using normal stressing procedures
12.8  Splicing tendons
12.9  Cracked wedges
12.10  Lift off procedures
12.11  Troubleshooting stressing equipment
     12.11.1  Jack is leaking
     12.11.2  Jack damages strand or will not grip strand
     12.11.3  Excessive seating loss (in excess of 3/8 in. [10 mm])
     12.11.4  Pump will not reach required gauge reading
     12.11.5  Pump is operating too slowly
     12.11.6  Gauges

13  PROJECT MAINTENANCE

14  LANDSCAPING

15  SUMMARY

15.1  General
15.2 For More Information

16  EXAMPLE PLANS

17  REFERENCES

17.1  Referenced standards
17.2  Cited references
17.3  Photo and figure credits

APPENDIX A  DEFINITIONS

APPENDIX B  EXAMPLE STRAND MATERIAL CERTIFICATION

APPENDIX C  EXAMPLE STRESSING JACK CALIBRATION FORM

APPENDIX D  EXAMPLE STRESSING ELONGATION RECORD FORM

APPENDIX E  TABLE OF ELONGATION VALUE

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